There are about as many ways to sew them together as there are colors of the rainbow!!! One thing to keep in mind as you sew your strips together is to alternate the direction you sew in. IE: Start at one end to sew the strips together, when you add the next strip, start at the end you ended on with the last one. I hope this makes sense! Anyway, this will help you NOT end up with a "crooked" square.